Improvement in grain-sieves



J. J. BRADNER.

Grain Sieve.

No. 42,551. Patented May 3, I864.

Zia/672507 N4 PETERS. Photo-Litho ra h Wnshillgialn D. c,

J. J. BRADNER, OF PINE CREEK, NEW YORK.

IMPROVEMENT IN GRAIN-SIEVES.

Specification forming part ofLclters Patent No. 41 2,55fl, dated May 3, 1864.

To all whom it may concern:

Be it known that I, J. J. BRADNER, of Pine Creek, in the county of Schuyler, and State of New York, have invented a new and useful Improvement in Compound Sieves or Screens for Separating Oats from Wheat; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, making part of this specification.

Figure l is a perspective view of my improved sieve or screen inverted or turned bottom upward; Fig. 2, a vertical section of the same.

Like letters of reference indicate corresponding parts in both figures.

My invention consists of a gang of sieves gradually decreasing in length from the top to the bottom one, thus forming a bevel on the back side of the gang for the purpose of more effectually receiving the angular blast from the fan, the spaces between the sieves being covered at the bevel by a fine mesh, to prevent the escape of the grain at the rear, substantially as hereinafter described.

I employ two, three, or more sieves, A B 0, arranged together, one above another, at suitable distances apart. These sieves extend out the same distance in front; but are made of different lengths, gradually decreasing from the top one to the bottom one, thus forming a bevel or incline, G, at the rear, the top impending over the base, as clearly represented. The spaces between the respective sieves, at the bevel or incline G, are covered at the rear by wire meshes a a of sufficient fineness to prevent any passage of grain through the same, but still allowing thefree passageof the blast from the fan. The top of the sieves are covered by the usual mesh, 7). This device is intended more particularly for separating oats from spring wheat, and is used with an ordinary fanning-machine.

Theblast from the fan strikes the sieves at an angle of about forty-five degrees, (as indicated by the arrow in Fig. 2,) and if the latter all extend back the same distance and are of the same length the blast is broken by the frames, and does not well enter at the end spaces to act upon the grain. This difficulty is remedied in a great degree by the bevel G; but in producin g this bevel another difficulty is encountered-via, the cross-piece of each screen,next the fan, breaks the blast to a certain degree, so that the first few lines of meshes therefrom do not receive its full benefit. Therefore a portion of the refuse in passing over the induction-edge of the screens will fall through these few meshes, there being no current at that point to buoy it up or sustain it, and, consequently, the chaff becomes mixed with the grain beneath the sieve, and an imperfect separation is the result. This difficulty is avoided by the arrangement of the fine meshes aa, covering the end spaces be tween the screens, as before described. Such chaff or refuse as falls through from the end of one screen is conducted by these inclined meshes to the next one below, and from that to the next, till it is finally blown off, leaving the grain perfectly clean. The advantages of these meshes covering the spaces in combination with a compound beveled sieve are manifest, for, while they effectually prevent any escape of chaff beneath, they still allow the blast to pass uninterruptedly through to the interior.

I do not claim, broadly, a compound sieve provided with the bevel; but

What I claim as my invention, and desire to secure by Letters Patent, is-- The inclined meshes a a, covering the end spaces between the screens, in combination with said screens arranged as a compound sieve, and having the bevel G, the whole arranged relatively to the blast, substantially as described, and constituting a new article of manufacture.

J. J. BRADNER. \Vitnesses:

G. W. GOODRICH, G. W. HUMIs'roN. 

